linux-kernel - Re: Kbuild problem

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Message-ID: <20070218104028.GU13958@stusta.de>
Date:	Sun, 18 Feb 2007 11:40:28 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Kai Germaschewski <kai.germaschewski@....edu>
Cc:	Tilman Schmidt <tilman@...p.cc>, Hansjoerg Lipp <hjlipp@....de>,
	gigaset307x-common@...ts.sourceforge.net, kkeil@...e.de,
	kai.germaschewski@....de, isdn4linux@...tserv.isdn4linux.de,
	linux-kernel@...r.kernel.org
Subject: Re: Kbuild problem

On Sun, Feb 18, 2007 at 12:22:10AM -0500, Kai Germaschewski wrote:
> On Sat, 17 Feb 2007, Tilman Schmidt wrote:
> 
> > Alright, then so be it. But that raises another question:
> > asyncdata.o is only needed for M105 and M101, not for the base
> > driver. How do I express in Kbuild that asyncdata.o is to be added
> > to gigaset-y only if CONFIG_GIGASET_M105 and CONFIG_GIGASET_M101
> > are not both 'n'?
> 
> The way this is typically done is via Kconfig. Add a config option 
> ASYNCDATA (actually something more descriptive/specific would be better), 
> add a "select ASYNCDATA" to the config options for m101 and m105, and then 
> you can use CONFIG_ASYNCDATA to decide whether to add asyncdata.o in the 
> Makefile.

One disadvantage of this approach is that in a kernel with 
CONFIG_GIGASET_BASE=y, you can't later compile and load the usb_gigaset 
or ser_gigaset modules without rebooting since they require a change to 
the kernel image.

> --Kai

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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